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Onek8
2025-01-22 16:18:30 +01:00
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commit a36294b518
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lib/aura/Tests/auratests/math/TestFFT.hx Normal file
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package auratests.math;
import utest.Assert;
import aura.math.FFT;
import Utils;
@:depends(auratests.types.TestComplexArray)
class TestFFT extends utest.Test {
function test_bitReverseUint32() {
// Haxe has some issue with signed/unsigned ints here, so we instead
// compare the individual strings as bits. This also makes the output in
// case of assertion failures much nicer to look at.
Assert.equals(Utils.int32ToBytesString(0xFF000000), Utils.int32ToBytesString(@:privateAccess aura.math.FFT.bitReverseUint32(0x000000FF, 32)));
Assert.equals(Utils.int32ToBytesString(0x00FF0000), Utils.int32ToBytesString(@:privateAccess aura.math.FFT.bitReverseUint32(0x0000FF00, 32)));
Assert.equals(Utils.int32ToBytesString(0x0000FF00), Utils.int32ToBytesString(@:privateAccess aura.math.FFT.bitReverseUint32(0x00FF0000, 32)));
Assert.equals(Utils.int32ToBytesString(0x000000FF), Utils.int32ToBytesString(@:privateAccess aura.math.FFT.bitReverseUint32(0xFF000000, 32)));
Assert.equals(Utils.int32ToBytesString(0xC0000000), Utils.int32ToBytesString(@:privateAccess aura.math.FFT.bitReverseUint32(0x00000003, 32)));
Assert.equals(Utils.int32ToBytesString(0x20000000), Utils.int32ToBytesString(@:privateAccess aura.math.FFT.bitReverseUint32(0x00000004, 32)));
Assert.equals(Utils.int32ToBytesString(0x00FF0000), Utils.int32ToBytesString(@:privateAccess aura.math.FFT.bitReverseUint32(0x000000FF, 24)));
Assert.equals(Utils.int32ToBytesString(0x0000FF00), Utils.int32ToBytesString(@:privateAccess aura.math.FFT.bitReverseUint32(0x0000FF00, 24)));
Assert.equals(Utils.int32ToBytesString(0x000000FF), Utils.int32ToBytesString(@:privateAccess aura.math.FFT.bitReverseUint32(0x00FF0000, 24)));
Assert.equals(Utils.int32ToBytesString(0x0000FF00), Utils.int32ToBytesString(@:privateAccess aura.math.FFT.bitReverseUint32(0x000000FF, 16)));
Assert.equals(Utils.int32ToBytesString(0x00000003), Utils.int32ToBytesString(@:privateAccess aura.math.FFT.bitReverseUint32(0x00000018, 5)));
}
function test_RealValuedFFT() {
final realFFT = new RealValuedFFT(64, 2, 1);
final inputBuffer = realFFT.getInput(0);
for (i in 0...realFFT.size) {
inputBuffer[i] = Math.sin(i / realFFT.size * 2 * Math.PI * 8);
}
realFFT.forwardFFT(0, 0);
var maxIdx = 0;
var maxVal = realFFT.getOutput(0)[0].real;
for (i in 1...realFFT.size) {
final val = realFFT.getOutput(0)[i].real;
if (val > maxVal) {
maxVal = val;
maxIdx = i;
}
}
Assert.equals(8, maxIdx);
realFFT.inverseFFT(1, 0);
// Assert that ifft(fft(array)) == array
for (i in 0...realFFT.size) {
Assert.floatEquals(realFFT.getInput(0)[i], realFFT.getInput(1)[i]);
}
}
function test_ComplexValuedFFT() {
final cplxFFT = new ComplexValuedFFT(64, 2, 1);
final inputBuffer = cplxFFT.getInput(0);
for (i in 0...cplxFFT.size) {
inputBuffer[i].real = Math.sin(i / cplxFFT.size * 2 * Math.PI * 8);
inputBuffer[i].imag = 0.0;
}
cplxFFT.forwardFFT(0, 0);
// var maxIdx = 0;
// var maxVal = cplxFFT.getOutput(0)[0].real;
// for (i in 1...cplxFFT.size) {
// final val = cplxFFT.getOutput(0)[i].real;
// if (val > maxVal) {
// maxVal = val;
// maxIdx = i;
// }
// }
// Assert.equals(8, maxIdx);
cplxFFT.inverseFFT(1, 0);
// Assert that ifft(fft(array)) == array
for (i in 0...cplxFFT.size) {
Assert.floatEquals(cplxFFT.getInput(0)[i].real, cplxFFT.getInput(1)[i].real);
Assert.floatEquals(cplxFFT.getInput(0)[i].imag, cplxFFT.getInput(1)[i].imag);
}
}
}